offline_test: fix event_log

Add some path setting to support event_log on Android.

BUG=chrome-os-partner:53061
TEST=Run offline thermal_load test

Change-Id: I52a24f4437ca49c4fa583ba6e6376320d5939381
Reviewed-on: https://chromium-review.googlesource.com/346872
Commit-Ready: Ting Shen <phoenixshen@chromium.org>
Tested-by: Ting Shen <phoenixshen@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
6 files changed